I Was Reincarnated as the 7th Prince so I Can Take My Time Perfecting My Magical Ability manga volume 10 features story by Kenkyo na Circle and art by Yosuke Kokuzawa.

What should have been another boisterous Advent Festival has instead become a festival of blood, with vile chimeras pouring from the depths to destroy Saloum--and all at the direction of Pope Guitane! The abominations created in Guitane's labs keep Grim and Lloyd's retainers busy on the ground, which means the only hope to defeat this evil plot is the duel in the air, between the prince and the pope himself!